<template>
<div>
  <!-- 面包屑导航区 -->
    <el-breadcrumb separator="/">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
  </el-breadcrumb>
  <!-- 卡片视图区域 -->
  <el-card>
    <!-- 头部警告区域 -->
    <el-alert
    title="注意：只允许为第三级分类设置相关参数！"
    type="warning" :closable='false' show-icon>
  </el-alert>
  <!-- 选择商品分类的区域 -->
  <el-row class="cat_opt">
    <el-col>
      <span>选择商品分类：</span>
      <!-- 选择商品分类的级联选择框 -->
    <el-cascader
    v-model="selectedCateKeys"
    :options="catlist"
    :props="cateProps"
    @change="handleChange"></el-cascader>
    </el-col>
  </el-row>
  <!-- tab 页签区域 -->
   <el-tabs v-model="activeName" @tab-click="handleTabClick">
     <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
      <!-- 添加参数的按钮 -->
      <el-button type="primary" size="min" :disabled='isBtnDisabled' @click="addDialogVisible = true">添加属性</el-button>
      <!-- 动态参数表格 -->
      <el-table :data="manyTableData" border stripe>
        <!-- 展开行 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
          <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close='handleClose(i, scope.row)'>
            {{item}}
          </el-tag>
          <!-- 输入的文本框 -->
          <el-input
            class="input-new-tag"
            v-if="scope.row.inputVisible"
            v-model="scope.row.inputValue"
            ref="saveTagInput"
            size="small"
            @keyup.enter.native="handleInputConfirm(scope.row)"
            @blur="handleInputConfirm(scope.row)"
          >
          </el-input>
          <!-- 添加的按钮 -->
          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
         <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button type="danger" icon="el-icon-delete" size="mini" @click= "removeParams(scope.row.attr_id)">删除</el-button>
            </template>
          </el-table-column>
      </el-table>
    </el-tab-pane>
    <!-- 添加动态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
      <!-- 添加属性的按钮 -->
       <el-button type="primary" size="min" :disabled='isBtnDisabled' @click="addDialogVisible = true">添加属性</el-button>
       <el-table :data="onlyTableData" border stripe>
        <!-- 展开行 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 循环渲染Tag标签 -->
          <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close='handleClose(i, scope.row)'>
            {{item}}
          </el-tag>
          <!-- 输入的文本框 -->
          <el-input
            class="input-new-tag"
            v-if="scope.row.inputVisible"
            v-model="scope.row.inputValue"
            ref="saveTagInput"
            size="small"
            @keyup.enter.native="handleInputConfirm(scope.row)"
            @blur="handleInputConfirm(scope.row)"
          >
          </el-input>
          <!-- 添加的按钮 -->
          <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
         <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
              <el-button type="danger" icon="el-icon-delete" size="mini" @click= "removeParams(scope.row.attr_id)">删除</el-button>
            </template>
          </el-table-column>
      </el-table>
    </el-tab-pane>
  </el-tabs>
  </el-card>
  <!-- 添加参数的对话框 -->
  <el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close='addDialogClosed'>
  <!-- 内容区域 -->
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <!-- 底部区域 -->
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改' + titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close='editDialogClosed'>
  <!-- 内容区域 -->
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <!-- 底部区域 -->
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类的列表数据
      catlist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的属性
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
          attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
     }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类的列表
   async getCateList () {
    const { data: res } = await this.$http.get('categories')
    if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败！')
    this.catlist = res.data
    // console.log(this.catlist)
    },
    // 级联选择框选中项变化会触发这个函数
   handleChange () {
      this.getParamsData()
    },
    // tab页签点击的处理函数
    handleTabClick () {
      // console.log(this.activeName)
       this.getParamsData()
    },
    // 获取参数的列表数据
   async getParamsData () {
      // 选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的id和当前所处的面板获取对应的参数
    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      //  console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
      const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮显示修改参数的对话框
   async showEditDialog (attrid) {
      // 查询当前参数的信息
    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, {
        params: {
          attr_sel: this.activeName
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
       {
         attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败！')
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除参数
   async removeParams (attrid) {
    const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => {
          return err
        })
        if (confirmResult !== 'confirm') return this.$message.info('已取消删除！')
        // 发起请求删除参数
const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    //  文本框失去焦点或按下回车键会触发的函数
   async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 证明输入了真实的内容
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求保存这次操作
     this.saveAttrVals(row)
   },
  //  将对 attr_vals 的操作保存到数据库
  async saveAttrVals (row) {
     const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败！')
      this.$message.success('修改参数项成功！')
   },
    // 点击按钮显示文本输入框
      showInput (row) {
        row.inputVisible = true
        // 输入框自动获取焦点
         this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 删除对应的参数项
      handleClose (i, row) {
        row.attr_vals.splice(i, 1)
        // 调用this.saveAttrVals(row)函数将操作保存到数据库
        this.saveAttrVals(row)
      }
  },
  // 定义计算属性
  computed: {
    // 如果按钮需要被禁用则返回true
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类id
      cateId () {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 动态计算标题的文本
      titleText () {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-cascader {
   width: 70%;
 }
 .el-tag {
   margin: 10px;
 }
 .input-new-tag {
   width: 120px;
   margin-left: 10px;
 }
</style>
